FFT Processor Utilizing Variable Length Shift Registers.
DEPARTMENT OF THE NAVY WASHINGTON D C
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The patent relates to a processor for radar and multichannel sonar spectral analysis of band-limited input signals based on a shift register implementation of a fast Fourier transform algorithm coupled with a single flow-through arithmetic unit. Speed is obtained by using an organization that performs the rapid data reordering required for execution of the algorithm. A post-processing unit is used to increase the quality of estimation of line spectra in statistically short term spectra. The unit can be used either as an integrator or as a first order recursive filter. The post-processing unit is implemented in a flowing point format to maintain the dynamic range.
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